xfrm: Const'ify address arguments to __xfrm_dst_lookup()

Signed-off-by: NDavid S. Miller <davem@davemloft.net>

net/xfrm/xfrm_policy.c

@@ -92,8 +92,8 @@ int xfrm_selector_match(const struct xfrm_selector *sel, const struct flowi *fl,
 }
 
 static inline struct dst_entry *__xfrm_dst_lookup(struct net *net, int tos,
-						  xfrm_address_t *saddr,
-						  xfrm_address_t *daddr,
+						  const xfrm_address_t *saddr,
+						  const xfrm_address_t *daddr,
 						  int family)
 {
 	struct xfrm_policy_afinfo *afinfo;